Process of preparing derivatives of bismethylaminotetraminoarsenobenzene which are soluble in water.



clare the following to Lonnn'z AGE AND nnnmnmv mnrnnrcn, or MANIi'HEIM, GERMANY,- nssren'ons T0 LUCIUS & BRUENING, OF IHilGIETS'II!0N-'JI'IHE-INIAIIDT,

' CESS 0F PREPARING DERIVATIVES BISMETHYLAMINOTETRAMINOARSENO- BENZEN'E WHICH ARE SOLUBLE Ho Drawing.

Processes of Preparing Derivatives of Bismethylaminotetraminoarsenobenzene which are Soluble in Water; and we do hereby debe a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

We have found that the derivatives of the bismethylaminotetraminoarsenobenzene substituted in the benzene nucleus, can be transformed into water-soluble compounds by means of an aqueous solution of a bicarbonate of an alkali or of ammonium bicarbonate. By adding a suitable organic solvent, such as alcohol, the said new compounds-which are probably carbaminatesmay also be separated in a solid form. Their solutions show an almost neutral reaction, are yellow in color, give a neutral reaction on turmeric paper, and yield carbonic acid, and a de rivative of bismethylaminotetraminoarsenobenzene when treated with hydrochloric acid. When stored with exclusion of air, the solutions are eminently stable and, therefore, particularly suitable for therapeutical pu oses.

T c process of preparing said new compounds consists in treating the said derivatives of the bismethylaminotetraminoarsenobenzene with a bicarbonate, the latter being added or produced in the solution.

The following examples illustrate our invention:

1.) 63.6 grams of the hydrochlorid o2.2 dichloro 4.4 bismethylamino 3.3 5.5 tetraminoarsenobenzene-produced according to Specification of Letters Patent.

Application filed June 15, 1915. Serial No. 34,247.

IN WATER.

Patented May 14, 1918..

U. S. Patent N 0. 1,180,627 of April 25, 1916, and having the formula:

on, on, 1i]: 14TH As are dissolved in 200 cc. of water and to the solution are added 200 cc. of 2 N -caustic soda lye. The base thus separated is filtered, well washed with water and suspended with exclusion of air (for instance in an atmos phere of carbon dioxid) in a solution of 9.5 g. of sodium bicarbonate in 1000 cc. of Water. On shaking this suspension, the base soon dissolves. The yellow solution thus obtained is filtered and stored in flasks filled with carbon dioxid. By adding alcohol a yellowish brown precipitate is obtained.

(2.) 10 g. of 2.2 .6.6 -tetrachloro-4.4 -bis methylamino-3.3 .5.5 -tetramino arsenoben-. zene hydrochlorid are dissolved in 100 (BC-Of water and there is gradually added, while shaking, a a normal solution of sodium bicarbonate or of ammonium bicarbonate until the base, at first precipitated, is again completely dissolved. For this purpose are re quired about 235 cc. of the said solution of sodium bicarbonate. The solution thus ob: tained has a brown color and gives, on adding alcohol, a brown precipitate.

The above mentioned 2.2 .6.6 -tetrachlor- 4.4 bismethylamino-3.3 155 tetramino ar senobenzene is produced in the'followmg manner p 2.6 dichloro 1.4 -diaminobenzene (see Bem'chte, vol. 8 (1875) pages 145/6) are acetylated so as to obtain 1-amino-2.6-d ichloro--acetylaminobenzene whereupon n the last mentioned compound the arsimc acld residue is substituted for the amino-group lent 197 (3.).

iflEtllYl sulfate so as to obtain -dimethylby diazotizing and then treating the resu ant diam-compound with sodium arsenite, 'lhe l-acetylamino-Q.ddichlorobenzene ersinic acid thus obtained,vvhich is insoluble in cold Water, readily soluble in hot Water, alcohol and allralis, and does not yet nielt 250 Cr-ls transformed by saponiiication by means of 2.6-dichloro benaene-arsinic acid (melting This body is treated with amino-2.6-dichlorohenzenearsinic acid, which constitutes a reddish powder, insoluble in diluted acids, cold water, benzene and acetone, soluble in hot alcohol, alkalis and hot glacial acetic acid. By nitrating this acid 4 niethylnitramino 3.5 dinitro 2.6- dichlorhenzenearsinic acid is obtained which is a reddish powder, readily soluble in hot alcohell, in a sodium acetate solution and in elite.- lis, insoluble in diluted acids, cold Water and benzene, and which on heating, decomposes at about 200 C. It is transformed by reduction into l P-bistuethylamino-S.3 .5.5 tetraniino 2.2 .56 tetrachloro arsenoben- Zeno. This compound is precipitated from the aqueous solution of its hydrochlorid by means of alkalis in the form of yellow flakes; 't forms a yellow hydrochlorid which is soluhis in Water, and a sulfate which is insoluble in water, and decomposes on heatin (3.) 11.1 grams of hydrochlorid oi 2,2 -dibronco- .ei -bisniethylaminofi .5." -tetrauiino-arsenobenzene Whose method. ofinanuffao ture is disclosed in Letters l atent the United States l lo. nieces; and which the formula:

a 2.22%4 tetrainetliylainino 3,8 .5.o -tetraini arsenobenrlene having the tow ula:

usion; s ,V/

i seen a diluted alkali into lennnoare dissolved in 2501 cc. of Water and to this 1 a yellow powder, soluble in alcohol, acetone and glacial acetic acid, insoluble in chloroform, ether and benzene and exploding When heated. By reducing this acid by means of tin and hydrochloric acid, and by precipitating with alcohol, the 2.2 AA -tetramethylanaino 3.3 ,5.5 tetraniino-arsenoben zene hydrochlorid is obtained in the form of yellow flakes.

Having now described our invention, vvhat We claim is 2- i. The process which consists in dissolving a derivative of '"-.l- -bismethylamino- 3.5.3 3 -tetrarninoarsenobenzene suhstituted in the benzene nucleus in Water by means of an alkaline bicarbonate.

2. The process which consists in suspending a derivative of hc -bisniethylamino 3.5.3 .o -tetraininoarsenobenzene substituted in the benzene nucleus in vvater in the presence of an alkaline compound, then intro ducing into the Whole carbon dionid.

3U process which consists in dissolv= mg the drocnlorid of derivative or isl niethylaniino 3. 5. 3 5

benzene substituted in the benzene nucleus 1 vvater in the presence oil an alkaline carhonate.

l, The process which consists in dissolvthe hydrochiorid of a derivative oil ar hismethylainino 5. 5.. 3 5 tetraniinoarsenobenzene substituted in the benzene nucleus in water in the presence of an alkaline-bicarbonate 5. The process which consists in dissolving 2.2 -dichloro-il -hismethylarnino-3.5.3 5 tetramiiroarsenobenzene in Water by means oi an allzaline bicarbonate 6. A solution of a derivative or h l -bismethylaniino 6 55.8 .5 stetraminoanenobenzene substituted in the benzene nucleus in an aqueous alkaline bicarbonate hath.

A solution of th 2.2 -diclilor-ls bismethylamhao-dfifilho traminoarsenoloenlzone in an a sous hie-a;

on the 2.

'When kept in a,

naeaeee 5 yellow color and giving a neutral reaction on turmeric paper, yielding, when treated with hydrochloric acid, carbonic acid and a bismethylamino tetraminoarsenobenzene substituted in the benzene nucleus, the aque- M) ous solutions yielding on addition of alcohol and ether the carbamate in form of yellowbrownish flakes.

10. As a new product, the aqueous solution of the carbaminate of 2.2 -dichloro-4A 1 5 bismethylamino 3. 5. 3 .5 I tetraminoarseno benzene, being of a yellow color and giving a neutral reaction on turmeric paper, yielding, when treated with hydrochloric acid, carbonic acid and 2.2 -dichloro-4A -bismethylamino 3.5.3 .5 tetraminoarsenobenzene, the aqueous solution yielding on addition of alcohol and etherthe carbamate in form of yellow-brownish flakes.

In testimony whereof we hereunto aflix our signatures in the presence of two witnesses. I

LORENZ AGH. HERMANN DIETERICH.

Witnesses:

O'rm HOFMANN, C. INNnss Bnowm 

